Question

Which organ helps the man to breathe?
A. Nose
B. Mouth
C. Ears
D. Eyes

Answer 1

Hint: Our respiratory system is the network of organs and tissues that help us to breathe. Besides helping us inhale and exhale, the respiratory system has many functions like warming the inhaling air to match with body temperature and moisturize it to humidity level of the body, help us to smell and removes wastes like carbon dioxide from the body during exhale.

Complete answer:
Part of our respiratory system includes: our airways deliver air to our lungs.
Our airways include
Mouth and nose: help is inhaling the air.
Sinuses: hollow area between the bones in our head that regulate the inhaled air temperature and humidity to the body level.
Pharynx: delivers air from mouth and nose to trachea.
Trachea: passage that connects the throat and lungs.
Lungs: two in number that deliver air to the alveoli and then to blood vessels.
From the alveoli, the blood vessels distribute oxygen to all the organs and tissues.
When we breathe out, our blood carries carbon dioxide and other wastes and delivers it to alveoli and finally through lungs and airways it is removed.
Cilia are tiny hair growth present along the airways that trap dust particles, etc and makes the air fit for inhalation.

Epiglottis: flap-like tissues that enclose the trachea during swallowing food and liquid.
Larynx is also called a voice box and produces sound when air moves in and out.

Note:
There are several conditions that affect our respiratory system like allergies (pollen, dust), asthma (chronic disorder that causes inflammation in airways that makes breathing difficult). Infection of the lungs can lead to pneumonia or bronchitis (inflammation of bronchial tubes). When we get older our lung capacity also decreases.